Apparatus for constructing conduits for wires, cables, &amp;c.



PATENI'ED MAY 15, 1906.

. H. ROSNER. APPARATUS FOR GONSTRUGTING GONDUITS FOR WIRES, GABLES, 6w

APPLICATION FILED MALI, 1905.

2 SHEETS-SHEET l.

m m will: m m

PATENTED MAY 15, 1906.

H. ROSNER. APPARATUS FOR OONSTRUOTING GONDUITS FOR WIRES, GABLES, 6m

APPLIUATION FILED MAEJ. 1905.

2 SHEETS-SHEET-2.

Witnesses.

Inventor UNITED STATES PATENT OFFICE.

HEINRICH ROSNER, OF LEMBERG, AUSTRIA-HUNGARY.

APPARATUS FOR CONSTRUCTING CONDUITS FOR WIRES, CABLES, &c.

Specification of Letters Patent.

latented. May 15, 1906.

Application filed March 1, 1905. Serial No. 247,972.

T0 at whom, it may concern:

Be it known that I, HEINRICH RosNER, a subject of the Emperor of Austria-Hungary, residing in 3 Passage Hausmann, Lemberg, Austria-Hungary, have invented a new and useful Improvement in Apparatus for Constructing Conduits for Wires, Cables, &c., of which the following is a specification.

This invention relates to an improved method of making conduits of plaster-ofparis or material havin like pro erties, wherein molds are provlded and aid in trenches in which the conduit is to be located and in which molds the conduit is formed.

The invention comprises a core made in relatively short sections and placed in channels formed in the mold, the conduit being built about the core, which is successively withdrawn from finished conduit-sections into the open portion of the mold with the object of forming a continuous and jointless conduit.

The invention consists more particularly in suspending the core adapted to form a conduit-passage of the desired size within the mold-channels and in packing about the core the material of which the conduit is to be made and allowing the same to stand until it begins to harden or set, whereupon the core is withdrawminto the open part of the mold, (excepting for a slight portion allowed to remain in the end of the finished conduit.) A further length of conduit is then formed corres ponding to the length of the core, the latter by reason of its retention in the finished end of.

the conduit preventing the formation of a joint between the finished and new sections.

The invention further consists in the provision of an improved core whereby the withdrawing operation at the completion of each section of the conduit may be quickly and easily effected without chipping or other wise injuring the conduit-passage.

With the foregoing objects in mind my invention consists in the improved method and core structure which will now be more specifically set forth by reference to the accompanying drawings, in which F1 ure 1 1s a plan view of a mold structure provlded with two conduit-forming channels and showing in one channel a completed section of conduit and in the other the core suspended prior to the formation of the conduit, one end showing the means for securin branch cables. Fi 2 is a cross-sectiona view on line A B of ig. 1. Fig. 3 is a detail view of a core adapted for making connectlons for branch wires. Fig. 4 1s a sectional view of a recess formed by said core. Flg. 5

is a detail of a plate adapted to be located in said recess. Fig. 6 is a sectional view similar to that shown in Fig. 2, on an enlarged scale. Fig. 7 is a detail in side elevation. of my improved core, showing in connection therewith means for suspending the same in the moldchannels. Fig. 8 is a sectional view on line C D of Fig. 7. Fig. 9 is a sectional view of a completed conduit. Figs. 10, 11, and 12 are sectlonal views of conduits made according to my invention. Y

The invention is carried out by providing in a suitable trench, trough, or other place wherein the conduit is to be located a mold such, for instance, as is shown at A. One or more channels 1 are formed in said mold, which extend throughout the length of the same for receiving the material of which the conduit is made. I

Within each of the channels there is suspended a core which, as shown, is composed of separate lateral sections 2 and 3 and an intervening spacing member 5, Figs. 7 and 8. As shown, each of the lateral core-sections 2 and 3 consists of hollow rectangular tubes, the outer corners being flattened or rounded, as desired, and each of the tubes being of the same size and adapted to lie closely together. The said tubes 2 and 3 are preferably provided with extensions 9, projecting from the upper and lower walls. Between said tubes 2 and 3 there is interposed a spacing-strip 5, desirably coextensive in width and length with respect to the cores. In making the conduit said sections 2 and 3 and the spaC- ing-plate 5 are assembled as shown in Figs. 7 and 8 and are held together by spring-clips 4. Said clips engage the core-sections 2 and 3 on the outer, upper, and lower walls thereof and serve to hold the same in horizontal alinement. Said clips extend upwardlyfrom their core-engaging portions and extend outwardly in opposite directions, as shown in Fig. 6, and engage the upper surface of the molding structure. When the clips are so engaged, they support the core-sections in the channels of the mold structure the required distances from each of the walls of said channels 1 to permit the plaster or other material of which the conduit is formed to be packed about and to entirely surround the core-sections, as shown in Fig. 6. Each of the core-sections 2 and 3 is of sufficient length to permit the same to be conveniently and easily handled, and in the form of the invention shown it is the object to construct the conduit in sections approximately the length of the core-sections and when one conduit-section is completed to withdraw the cores therefrom into the open or unoccupied portion of the channel to form a second conduit-section, each section being joined so as to form a continuous structure. When the core members are assembled, they are inserted in the channels 1, Fig. 1,-in the manner shown to the left of said figure, the cores being supported by two clips 4. When the channel is filled, the core-sections are with drawn, as shown at the right of Fig. 1. The core-sections are not wholly withdrawn, as it is found desirable to leave the end portions in the finished conduit in order that the passage may be continuous and in perfect alinement and in order to form the conduit structure continuous and without joints. As shown at the right of Fig. 1, the core-sections are almost completely withdrawn from the finished conduit and one of the clips 4 is dispensed with, the core being supported in the finished conduit at one end and in the open mold at the other end by one of the clips 4.

The core-sections are withdrawn in the following manner: By reference to Fig. 7 it will be noted that the spacing-plate 5 extends some distance beyond the core-sections 2 and 3 and is provided with a hole or aperture for the insertion of a hook or like instrument. Before the core-sections 2 and 3 are withdrawn, in the position shown to the right of Fig. 1, the operator withdraws the spacing-plate 5, thereby leaving a space between the abutting walls of the core-sections 2 and 3.

It will be obvious from the foregoing that by reason of this space the operator is enabled to readily grasp the handles 6 and 7 of the core-sections and withdraw the same from the conduit. When the core-sections are assembled, the spacing-plate may be lubricated on opposite sides to facilitate its withdrawal.

By providing the extensions 9 and a spac ing-plate of sufficient width to bring its edges flush with the extensions there is formed in the upper and lower walls of the conduit-passage upper and lower alined grooves. These grooves are adapted to receive a partition 11, made of suitable insulating material and serving to divide the conduit-passage into two longitudinal compartments. It will thus be seen that by my improved method I am enabled to construct two compartments in the formation of. each conduit-passage, which is a feature of great practical importance. If

it is desired to strengthen or further protect the conduit, the same may be provided with stifiening-plates 21, as shown in Fig. 9, or with reinforcing-wires 21, as shown in Figs. 10 to 12, inclusive. It will be further obvious that by the employment of two cores, such as shown in Fig. 8, a double conduit may be made, such as shown in Fig. 11.

Where it is desired to connect one or more conduits or to run branch cables from a con duit, the latter is provided with lateral openings or passages formed by a core 16, (shown vin Fig. 3,) which forms a hollow cylindric recess 14 (shown in Fig. 4) and serving to connect one or more conduits. The outer or open end of the passage 14 may be closed by a cap 18, as shown in Fig. 5, the flange thereof resting in an annular recess 19, formed by the flange 17 of the core 16.

What I claim, and desire to secure by Letters Patent, is

1. A core of the class described comprising separate lateral core members provided with flanges extending beyond the body portions of said cores, and an interposed spacing member flush with said flanges, substantially as described.

2. A core of the class described comprising separate lateral core members, and an interposed spacing member, in combination with resilient means engaging said members to hold them in an assembled position, said means also serving as a support for said cores, substantially as described.

3. A core of the class described comprising separate lateral core members, and an interposed spacing member, in combination with a spring-clip surrounding and holding said core members in an assembled position and provided with laterally-extending arms for suspending said cores, substantially as described.

4. The combination of a mold structure.

IIO 

